|Season|Competition|Round|Club|Home|Away|Aggregate|
|---|---|---|---|---|---|---|
|2003|UEFA Intertoto Cup|R1|WIT Georgia|1-0|1-2|2-2|
|||R2|FK Pobeda|2-1|1-1|3-2|
|||R3|Tobol Kostanay|3-0|1-0|4-0|
|||Semifinals|Werder Bremen|4-0|1-1|5-1|
|||Finals|FC Schalke 04|0-2|0-0|0-2|
|2004/05|UEFA Cup|Q2|Zenit St. Petersburg|3-1|0-2|3-3|
|2005/06|UEFA Cup|Q2|Zenit St. Petersburg|2-2|1-1|3-3|
|2006/07|UEFA Cup|1|Livorno|0-1|0-2|0-3|

Question: what is the difference in the amount of home games won versus home games lost for werder bremen?
Answer: 4